Spin Resolved Electronic Structures of Half-Metallic Ferromagnetic Single Crystalline Thin Films

半金属铁磁单晶薄膜的自旋分辨电子结构

• 批准号: 17340112
• 负责人: KIMURA Akio
• 金额: $ 5.76万
• 依托单位: Hiroshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17340112/
• 关键词: Half-metallic ferromagnet; Spin resolved photoelectron spectroscopy; Molecular beam epitaxy; Magnetic ultra-thin film; 放射光ビームライン

The aim of this work is to clarify the spin polarized band structures of crystalline thin films of the full Heusler-type ferromagnetic alloys grown by molecular beam epitaxy (MBE) method, which are expected to show completely spin-polarized (half-metallic) electronic states, utilizing spin-resolved photoelectron spectroscopy.The ultra-thin magnetic film of fcc Co/Cu(001) has been fabricated and its spin dependent electronic structures have been successfully obtained. Especially, the negatively spin-polarized surface state has been firstly observed. This finding would play an important role to understand the origin of the magnetic transport phenomena in the tunneling magneto-resistance devices.We have done the similar measurement also for fcc Fe ultra-thin films. The observed spin-polarized photoelectron spectra have enabled us to estimate a correct value of the exchange splitting of Fe 3d states.The electronic structures in the bulk of the Heuler-type ferromagnetic alloys, NiMnSb, Ru_<2-x>Fe_xCrZ (Z=Si, Ge) and Co_2MnX (X=Si, Ga, Ge), which are predicted to show "half-metallic" electronic structures, have been clarified by the soft and hard X-ray photoelectron spectroscopies.The above-mentioned activities have been presented at several international and domestic conferences.

这项工作的目的是阐明分子束外延（MBE）方法生长的全赫斯勒型铁磁合金晶体薄膜的自旋极化能带结构，该合金有望表现出完全自旋极化（半金属）电子利用自旋分辨光电子能谱制备了面心立方Co/Cu(001)超薄磁性薄膜，并成功获得了其自旋相关电子结构。特别是，首次观察到负自旋极化表面态。这一发现对于理解隧道磁阻器件中磁输运现象的起源将发挥重要作用。我们也对面心立方铁超薄膜进行了类似的测量。观察到的自旋极化光电子能谱使我们能够估计 Fe 3d 态交换分裂的正确值。Heuler 型铁磁合金、NiMnSb、Ru_<2-x>Fe_xCrZ (Z=预计显示“半金属”电子结构的Si、Ge)和Co_2MnX(X=Si、Ga、Ge)已被软、硬X射线澄清上述活动已在多个国际国内会议上进行介绍。

项目成果

Magnetism of Fe films grown on Co(001) studied by spin-resolved Fe3s photoemission

通过自旋分辨 Fe3s 光电子发射研究在 Co(001) 上生长的 Fe 薄膜的磁性

• 发表时间: 2006
• 期刊: Phys. Rev. B 73・9
• 作者: Cui Yitao;Akio Kimura;Hitoshi Sato;N.Kamakura
• 通讯作者: N.Kamakura

The performance test of spin-resolved photoelectron spectrometer at HSRC

• DOI: 10.1016/j.elspec.2005.01.096
• 发表时间: 2005-06-01
• 期刊: JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
• 影响因子: 1.9
• 作者: Iori, K;Miyamoto, K;Taniguchi, A
• 通讯作者: Taniguchi, A

Electronic structures of Fe_<3-x>V_xSi probed by photoemission spectroscopy

光电子能谱探测Fe_<3-x>V_xSi的电子结构

• 发表时间: 2006
• 期刊: phys. stat. sol.(a) 203・11
• 作者: Cui Yitao

放射光X線磁気分光と散乱(橋爪弘雄,岩住俊明編)

同步加速器X射线磁光谱和散射（桥爪博夫、岩泉俊明编辑）

• 发表时间: 2007
• 作者: T;Ohkochi;K;Mibu;N;Hosoito;木村昭夫(分担執筆)
• 通讯作者: 木村昭夫(分担執筆)

Cr adsorption effect of magnetic property of Fe/Cu(001)

Fe/Cu(001)磁性的Cr吸附效应

• 发表时间: 2006
• 期刊: e-Journal of Surface Science and Nanotechnology 4(掲載可)
• 作者: M. Takeda;et. al.;壬生 攻 他;Koichiro Yaji
• 通讯作者: Koichiro Yaji